﻿The Si/mpoda. 149 



the uropods, its last third veuy narrow, tapering, somewhat curved, 

 with an apical pair of spines, larger than the ansymmetrically placed 

 lateral spines, four on the left, three on the right. 



First antennae with stout peduncle carrying a few denticles, the 

 lirst joint the longest, the third ending in a subcircular process from 

 which amidst a bash of filaments issue the two very slender flagella, 

 the principal five jointed, its first joint the longest, the accessory 

 four-jointed, its first joint the shortest. Second antennae with second 

 joint of peduncle four times as long as the third, twice the- fourth, 

 and two-thirds the length of the fifth joint ; the flagellum short, not 

 twice the peduncle, of about twenty joints. 



The mouth organs show substantial agreement with those in 

 Diastylis, the upper lip slightly emarginate, the first maxillae with 

 bisetose palp, the m^ndLbles with tapering base, not broad as in 

 Diastyloides, the molar well developed but not very stout, the first 

 maxillipeds with no great number of branchial leaflets, the third 

 with long plumose setje oa the somewhat dilated end of the long 

 curved second joint. 



First peraeopods with second joint much like that of the third 

 maxillipeds, but much more denticulate and forming a narrower 

 neck ; the distal joints missing. Second pair with a much shorter 

 second joint, stout, not longer than the loQg fifth and short sixth 

 joints combined, fourth joint not half the length of the slender fifth, 

 nor the sixth half the seventh. The following limbs successively 

 shorter, the third and fourth distinguished by their denticulate 

 second joint, strikingly narrowed distally. The fifth pair being as 

 usual devoid of exopods, such as are borne by the five preceding pairs 

 of appendages, has a smooth uniformly narrow second joint. 



The first pleopods are considerably larger than the second, with 

 more numerous setae on the peduncle ; the little two-jointed outer 

 ramus slightly shorter than the one-jointed inner, while in the 

 second pair there is equality or the outer ramus is a little the 

 longer, in each case carrying four plumose setae while the inner ramus 

 has eight. The peduncle of the uropods about equals in length the 

 fourth, fifth, and sixth pleon segments combined, the exopod equalling 

 the fifth and sixth combined, and barely exceeding the two remaining 

 joints of the endopod, in which the second joint is two-thirds the 

 length of the first. 



Length of the specimen about 9 mm., of which the pleon 

 occupies 5 mm. 



Locality. Cape Natal N. by E. about 24: miles ; depth 805 m. ; 

 No. 12605, sent by Dr. Peringuey. 



